IAI America PCON-CFA User Manual
Page 246
4. SCON-CA
238
(26) Load output judgment (LOAD) PLC input signal
This signal is available only in the pressing operation.
When this signal is used for pressing-in purpose, it should be know whether if the set load threshold is
reached during the pressing operation.
The load threshold and check range are set by the PLC and the LOAD signal will turn ON when the
command torque (motor current) exceeds the threshold inside the check range.
This signal judges the load output based on the fact that the command torque excesses the threshold for
the specified time period.
This processing procedure is the same as for the pressing judgment. The judgment time period can be
changed freely using the parameter No. 50 “Load Output Judgment Time Period”.
This signal is continued until the next movement command is received.
x
Set the pressing speed using the parameter No. 34 “Pressing Speed”.
When the machine is delivered, it has been individually set depending on the actuator characteristics.
Set an appropriate speed considering the work part material and shape.
x
Set the parameter No. 50 “Load Output Judgment Time Period”.
x
Set the threshold inspected width using the PLC's Zone Boundary + Register or Zone Boundary - Register.
x
Set the threshold using the PLC's Load Current Threshold Register.
x
Set the positioning band using the PLC's Positioning Band Register.
Set it a bit longer from the backmost position considering the mechanical dispersion of the work part.
Refer to the Operation Manual for the controller for more information.
Caution: The actuator continues to push the work part with the pressing current at the stop time decided
with the current-limiting value.
It is not the stop condition, so take the greatest care to deal with it.
Position where this signal is
turned ON when the command
torque exceeds the threshold
within the torque inspected width
Position where the actuator is pushed
against the work and the pressing
completion is judged so the positioning
completion signal is turned “ON”
Speed
Travel
Positioning band (Max. pressing level)
Check range